Here are a few cards I came up with.
Card 1
Name: Electrical Thunder Bug
Card Type: Normal Monster
Card Level: 3
Card Attribute: Earth
Card Description/Effect: A bug that was found crawling around under a power plant.
Card Stats: Atk 1400/ Def 1900
Card 2
Name: Pyro Maniac
Card Type: Effect Monster
Card Level: 4
Card Attribute: Fire
Card Description/Effect: When this card inflicts battle damage to your opponent's life points, discard a card in your hand and draw a card from your deck.
Card Stats: Atk 1700/ Def 900
Card 3
Name: Winged Kuriboh Triumph
Card Type: Magic Card
Card Level: N/A
Card Attribute: Continous Magic Card
Card Description/Effect: Once per turn during your opponent's battle phase, pay 2000 LP to negate the opponents attack and end their battle phase.
Card 4
Name:Poisin Skull
Card Type: Trap Card
Card Level: N/A
Card Attribute: Normal Trap Card
Card Description/Effect: When your opponent attacks you in their battle phase, activate this card. Negate your opponent's attack and decrease the ATK and DEF of that monster by 500.